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For over a decade, I have dedicated my career to sleep and circadian research, working with diverse populations from airline pilots, submariners, and elite athletes to school children, sleep medicine patients, and the general population. My expertise lies in designing and implementing ecological protocols in sleep and circadian medicine, an approach pursued by only a few worldwide. I established one of the largest clinical databases of Delayed Sleep-Wake Phase Disorder (DSWPD) patients, integrating clinical, actigraphy, polysomnography, and melatonin data, which has resulted in multiple high-impact publications. I also pioneered the first molecular biomarker study on circadian disruption in military personnel, a globally unique dataset. My work includes validating actigraphy algorithms, sleep questionnaires, and novel sleep assessment methods, further enhancing precision in sleep research. As an acknowledged expert in DSWPD, I was invited by the European Sleep Research Society to author the Delayed Sleep-Wake Phase Disorder chapter in the official Sleep Medicine Textbook. I also spearheaded the largest European sleep questionnaire dataset (~280K participants), providing unparalleled insights into sleep patterns at a population level. Beyond research, I am committed to education and capacity building. I participated in the establishment of the world’s first Master’s in Sleep and Circadian Medicine at the Faculty of Medicine, Lisbon, and have coordinated multiple short courses and postgraduate programs in sleep psychology, actigraphy, and circadian medicine. My mentorship spans MSc, PhD, and undergraduate students, fostering the next generation of sleep researchers. Internationally, I am a board member of the European Sleep Research Society (educational and communication). I have played a key role in collaborative research networks, including COVID-19 sleep studies and projects influencing sleep health policies. As a reviewer for top journals (SLEEP, PLOS Medicine, JSR, Translational Psychiatry), a grant evaluator, and a parliamentary consultant on-time policy, I actively contribute to shaping the future of sleep science. Besides being an early career researcher I already secured competitive funding (Ministry of Defence, BIAL), my work blends scientific excellence, innovation, and societal impact, placing Portugal at the forefront of sleep and circadian medicine.
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Identification

Personal identification

Full name
Cátia Cristina Peixinho Reis

Citation names

  • Reis, Cátia

Author identifiers

Ciência ID
C817-4B30-902F
ORCID iD
0000-0001-6585-3993
Scopus Author Id
55821577400

Email addresses

  • catia.reis@medicina.ulisboa.pt (Professional)
  • catia.reis@ucp.pt (Professional)

Knowledge fields

  • Natural sciences - Biological Sciences - Behavioural Sciences Biology

Languages

Language Speaking Reading Writing Listening Peer-review
Portuguese (Mother tongue)
English Proficiency (C2) Proficiency (C2) Advanced (C1) Proficiency (C2) Advanced (C1)
French Intermediate (B1) Elementary (A2) Elementary (A2) Intermediate (B1) Elementary (A2)
Spanish; Castilian Upper intermediate (B2) Upper intermediate (B2) Upper intermediate (B2) Advanced (C1) Upper intermediate (B2)
Italian Elementary (A2) Elementary (A2) Beginner (A1) Elementary (A2) Elementary (A2)
Education
Degree Classification
2021 - 2021/11/30
Concluded
 Somnologist - Sleep Scientist (Postgraduate Certificate)
European Sleep Research Society/Sleep Research and Sleep Medicine in Europe, Germany
2016/03/15 - 2020/05/27
Concluded
 EnviHealth&Co (Doutoramento)
Major in FCT grant PDE / BDE / 114584 / 2016
Universidade de Lisboa Faculdade de Medicina, Portugal
"Sleep patterns in Portugal: European and International comparisons" (THESIS/DISSERTATION)
2014/09/05 - 2016/03/10
Attended
 CAML - PhD program in Biomedical Sciences (Curso de doutoramento (conclusão de unidades curriculares))
Universidade de Lisboa Faculdade de Medicina, Portugal
2011/09/15 - 2012/06/15
Concluded
 Travel Medicine Course (Diploma de especialização)
Universidade Nova de Lisboa Instituto de Higiene e Medicina Tropical, Portugal
 18
2009/09/15 - 2011/12/15
Concluded
 Human Biology and Environment (Mestrado)
Universidade de Lisboa Faculdade de Ciências, Portugal
 17
1999/09/20 - 2005/02/01
Concluded
 Biology – Environmental Biology – Marine resources (Licenciatura)
Universidade de Lisboa Faculdade de Ciências, Portugal
 13
Outputs

Publications

Book chapter
  1. Reis, Cátia; Abbot, Sabra. "F.2.2. Pathophysiology - delayed sleep-wake phase disorder". In European Sleep Medicine Textbook (Second Edition). European Sleep Research Society, 2021.
    Published
Journal article
  1. Cátia Reis; Luísa K. Pilz; Teresa Paiva; Maria Paz Hidalgo; Kenneth P. Wright, Jr. "Sleep and circadian rhythms in delayed sleep–wake phase disorder: Phenotypic differences between patients with and without comorbid depression". Journal of Sleep Research (2025): https://doi.org/10.1111/jsr.14437.
    10.1111/jsr.14437
  2. Joana Rodrigues; Vânia Magalhães; Maria Paula Santos; Cátia Reis; Fernando Pichel; Paulo Soares; Jorge Santos; Sofia Vilela. "Weight loss in patients with severe obesity after bariatric surgery–the potential role of the chrono-nutrition, chronotype and the circadian misalignment". PLoS one 19 11 (2024): https://ciencia.ucp.pt/en/publications/bd3b4d0d-7090-4435-97aa-6511a8c66fa7.
    10.1371/journal.pone.0313096
  3. Miguel Tecedeiro; Cátia Reis; João Marôco. "Assessing non-dysfunctional attitudes toward sleep: psychometric properties of the Charlotte Attitudes Toward Sleep scale in Portuguese samples". Psicologia: Reflexão e Crítica (2024): https://doi.org/10.1186/s41155-024-00320-3.
    10.1186/s41155-024-00320-3
  4. Pei Xue; Ilona Merikanto; Eva A. Delale; Adrijana Bjelajac; Juliana Yordanova; Rachel N. Y. Chan; Maria Korman; et al. "Associations between obesity, a composite risk score for probable long COVID, and sleep problems in SARS-CoV-2 vaccinated individuals". International Journal of Obesity 48 9 (2024): 1300-1306. https://ciencia.ucp.pt/en/publications/96a69782-8d08-4607-a7ed-1e5ed1ff4ac1.
    10.1038/s41366-024-01556-w
  5. Daniel Gabaldón-Estevan; Diego Carmona-Talavera; Belén Catalán Gregori; Elena Mañas García; Vanessa Martin-Carbonell; Lucia Monfort; Elvira Martinez-Besteiro; et al. "Kairos Study Protocol: A Multidisciplinary Approach to the Study of School Timing and its Effects on Health, Well-being and Students Performance". Frontiers in Public Health (2024): https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2024.1336028/abstract.
    Accepted • 10.3389/fpubh.2024.1336028
  6. Bolstad, Courtney J.; Holzinger, Brigitte; Scarpelli, Serena; De Gennaro, Luigi; Yordanova, Juliana; Koumanova, Silvia; Mota-Rolim, Sérgio; et al. "Nightmare frequency is a risk factor for suicidal ideation during the COVID-19 pandemic". Journal of Sleep Research (2024): http://dx.doi.org/10.1111/jsr.14165.
    In press • 10.1111/jsr.14165
  7. Korman, Maria; Zarina, Daria; Tkachev, Vadim; Merikanto, Ilona; Bjorvatn, Bjørn; Bjelajac, Adrijana Koscec; Penzel, Thomas; et al. Corresponding author: Korman, Maria. "Estimation bias and agreement limits between two common self-report methods of habitual sleep duration in epidemiological surveys". Scientific Reports 14 1 (2024): http://dx.doi.org/10.1038/s41598-024-53174-1.
    Published • 10.1038/s41598-024-53174-1
  8. Berezin, Linor; Waseem, Rida; Merikanto, Ilona; Benedict, Christian; Holzinger, Brigitte; De Gennaro, Luigi; Wing, Yun Kwok; et al. "Habitual short sleepers with pre-existing medical conditions are at higher risk of Long COVID". Journal of Clinical Sleep Medicine 20 1 (2024): 111-119. http://dx.doi.org/10.5664/jcsm.10818.
    Published • 10.5664/jcsm.10818
  9. Chen, Si-Jing; Morin, Charles M.; Ivers, Hans; Wing, Yun Kwok; Partinen, Markku; Merikanto, Ilona; Holzinger, Brigitte; et al. "The association of insomnia with long COVID: An international collaborative study (ICOSS-II)". Sleep Medicine 112 (2023): 216-222. http://dx.doi.org/10.1016/j.sleep.2023.09.034.
    Published • 10.1016/j.sleep.2023.09.034
  10. Matsui, Kentaro; Chung, Frances; Bjelajac, Adrijana Koscec; Merikanto, Ilona; Korman, Maria; Mota-Rolim, Sérgio; Cunha, Ana Suely; et al. "Associations between changes in habitual sleep duration and lower self-rated health among COVID-19 survivors: findings from a survey across 16 countries/regions". BMC Public Health 23 1 (2023): http://dx.doi.org/10.1186/s12889-023-17258-3.
    Published • 10.1186/s12889-023-17258-3
  11. Cátia Reis; Luísa K. Pilz; Achim Kramer; Luísa V. Lopes; Teresa Paiva; Till Roenneberg. Corresponding author: Cátia Reis. "The impact of daylight-saving time (DST) on patients with delayed sleep-wake phase disorder (DSWPD)". Journal of Pineal Research (2023): https://doi.org/10.1111/jpi.12867.
    10.1111/jpi.12867
  12. Xue, Pei; Merikanto, Ilona; Chung, Frances; Morin, Charles M.; Espie, Colin; Bjorvatn, Bjørn; Cedernaes, Jonathan; et al. "Persistent short nighttime sleep duration is associated with a greater post-COVID risk in fully mRNA-vaccinated individuals". Translational Psychiatry 13 1 (2023): http://dx.doi.org/10.1038/s41398-023-02334-4.
    Published • 10.1038/s41398-023-02334-4
  13. Bjorvatn, Bjørn; Merikanto, Ilona; Reis, Catia; Korman, Maria; Bjelajac, Adrijana Koscec; Holzinger, Brigitte; De Gennaro, Luigi; et al. "Shift workers are at increased risk of severe COVID-19 compared with day workers: Results from the international COVID sleep study (ICOSS) of 7141 workers". Chronobiology International (2022): 1-9. http://dx.doi.org/10.1080/07420528.2022.2148182.
    Published • 10.1080/07420528.2022.2148182
  14. Merikanto, Ilona; Dauvilliers, Yves; Chung, Frances; Wing, Yun Kwok; De Gennaro, Luigi; Holzinger, Brigitte; Bjorvatn, Bjørn; et al. "Sleep symptoms are essential features of long-COVID – Comparing healthy controls with COVID-19 cases of different severity in the international COVID sleep study (ICOSS-II)". Journal of Sleep Research (2022): http://dx.doi.org/10.1111/jsr.13754.
    Published • 10.1111/jsr.13754
  15. Canas-Simião, Hugo; Reis, Cátia; Carreiras, Diogo; Espada-Santos, Pedro; Paiva, Teresa. "Health-Related Behaviors and Perceived Addictions". Journal of Nervous & Mental Disease Publish Ah (2022): http://dx.doi.org/10.1097/nmd.0000000000001503.
    10.1097/nmd.0000000000001503
  16. Merikanto, Ilona; Dauvilliers, Yves; Chung, Frances; Holzinger, Brigitte; De Gennaro, Luigi; Wing, Yun Kwok; Korman, Maria; et al. "Disturbances in sleep, circadian rhythms and daytime functioning in relation to coronavirus infection and Long-COVID – A multinational ICOSS study". Journal of Sleep Research (2021): http://dx.doi.org/10.1111/jsr.13542.
    Open access • Accepted • 10.1111/jsr.13542
  17. Reis, Cátia; Tecedeiro, Miguel; Pellegrino, Pollyana; Paiva, Teresa; Marôco, João P.. "Psychometric Properties of the Oldenburg Burnout Inventory in a Portuguese Sample of Aircraft Maintenance Technicians". Frontiers in Psychology 12 (2021): http://dx.doi.org/10.3389/fpsyg.2021.725099.
    Open access • 10.3389/fpsyg.2021.725099
  18. Ann-Sophie Loock; Ameena Khan Sullivan; Catia Reis; Teresa Paiva; Neda Ghotbi; Luisa K. Pilz; Anna M. Biller; et al. "Validation of the Munich Actimetry Sleep Detection Algorithm for estimating sleep–wake patterns from activity recordings". Journal of Sleep Research (2021): https://doi.org/10.1111/jsr.13371.
    Open access • 10.1111/jsr.13371
  19. Maria Korman; Vadim Tkachev; Cátia Reis; Yoko Komada; Shingo Kitamura; Denis Gubin; Vinod Kumar; Till Roenneberg. "Outdoor daylight exposure and longer sleep promote wellbeing under COVID-19 mandated restrictions". Journal of Sleep Research (2021): https://doi.org/10.1111/jsr.13471.
    Open access • 10.1111/jsr.13471
  20. Sara Gamboa Madeira; Cátia Reis; Teresa Paiva; Carlos Santos Moreira; Paulo Nogueira; Till Roenneberg. "Social jetlag, a novel predictor for high cardiovascular risk in blue-collar workers following permanent atypical work schedules". Journal of Sleep Research (2021): https://doi.org/10.1111/jsr.13380.
    Open access • 10.1111/jsr.13380
  21. Teresa Paiva; Cátia Reis; Amélia Feliciano; Hugo Canas-Simião; Maria Augusta Machado; Tânia Gaspar; Gina Tomé; et al. "Sleep and Awakening Quality during COVID-19 Confinement: Complexity and Relevance for Health and Behavior". International Journal of Environmental Research and Public Health (2021): https://doi.org/10.3390/ijerph18073506.
    Open access • 10.3390/ijerph18073506
  22. Korman, Maria; Tkachev, Vadim; Reis, Cátia; Komada, Yoko; Kitamura, Shingo; Gubin, Denis; Kumar, Vinod; Roenneberg, Till. "COVID-19-mandated social restrictions unveil the impact of social time pressure on sleep and body clock". Scientific Reports (2020): https://doi.org/10.1038/s41598-020-79299-7.
    Open access • Published • 10.1038/s41598-020-79299-7
  23. Reis, Cátia; Staats, Richard; Pellegrino, Pollyanna; Alvarenga, Tathianna A.; Bárbara, Cristina; Paiva, Teresa. "The prevalence of excessive sleepiness is higher in shift workers than in patients with obstructive sleep apnea". Journal of Sleep Research (2020): e13073-e13073. https://doi.org/10.1111/jsr.13073.
    Published • 10.1111/jsr.13073
  24. Neutel, Dulce; Reis, Cátia; Alvarenga, Tathiana; Paiva, Teresa. "Retrospective Study Suggests that Chronic Insomnia Behaves as a Neurodegenerative Disorder". Journal of Sleep Disorders and Therapy (2020): https://www.longdom.org/open-access/a-retrospective-study-suggests-that-chronic-insomnia-behaves-as-a-neurodegenerative-disorder-53729.html#ai.
    Published
  25. Reis, Cátia; Pilz, Luisa Klaus; Keller, Lena; Paiva, Teresa; Roenneberg, Till. "Social timing influences sleep quality in patients with sleep disorders". Sleep Medicine (2020): https://doi.org/10.1016/j.sleep.2020.02.019.
    Published • 10.1016/j.sleep.2020.02.019
  26. Reis, C.; Madeira, S.G.; Lopes, L.V.; Paiva, T.; Roenneberg, T.. "Validation of the Portuguese Variant of the Munich Chronotype Questionnaire (MCTQPT)". Frontiers in Physiology 11 (2020): http://www.scopus.com/inward/record.url?eid=2-s2.0-85088785834&partnerID=MN8TOARS.
    10.3389/fphys.2020.00795
  27. Staats, R.; Barros, I.; Fernandes, D.; Grencho, D.; Reis, C.; Matos, F.; Valença, J.; et al. "The Importance of Sleep Fragmentation on the Hemodynamic Dipping in Obstructive Sleep Apnea Patients". Frontiers in Physiology 11 (2020): http://www.scopus.com/inward/record.url?eid=2-s2.0-85082644251&partnerID=MN8TOARS.
    10.3389/fphys.2020.00104
  28. Reis, Cátia; Paiva, Teresa. "Delayed sleep-wake phase disorder in a clinical population : gender and sub-population diferences". Sleep Science (2019): http://hdl.handle.net/10451/41369.
    Open access • Published • 10.5935/1984-0063.20190086
  29. Reis, Cátia; Dias, Sara Simões; Rodrigues, Ana Maria; Sousa, Rute Dinis; Gregório, Maria João; Branco, Jaime; Canhão, Helena; et al. "Sleep duration, lifestyles and chronic diseases: a cross-sectional population-based study". Sleep science (Sao Paulo, Brazil) (2018): http://hdl.handle.net/10400.8/3930.
    Open access • Published • 10.5935/1984-0063.20180036
  30. Mestre,Catarina; Lopes,António; Reis,Cátia; Costa,Sara Lemos da; Albuquerque,Cristina. "Translation and validation of two questionnaires assessing fear of flying for Portuguese language". Análise Psicológica 3 XXXV (2017): 367-381. http://www.scielo.mec.pt/scielo.php?script=sci_arttext&pid=S0870-82312017000300009.
    Open access • Published
  31. Mestre, C.; Lopes, A.; Reis, C.; da Costa, S.L.; Albuquerque, C.. "Translation and validation of two questionnaires assessing fear of flying for portuguese language". Analise Psicologica 35 3 (2017): 351-365. http://www.scopus.com/inward/record.url?eid=2-s2.0-85028926648&partnerID=MN8TOARS.
    10.14417/ap.1197
  32. Reis, Cátia. "Sleep and Fatigue Differences in the Two Most Common Types of Commercial Flight Operations.". Aerospace medicine and human performance (2016): https://doi.org/10.3357/AMHP.4629.2016.
    Published • 10.3357/amhp.4629.2016
  33. Reis, Cátia; Reis, Cátia; Mestre, Catarina; Canhão, Helena; Gradwell, David; Paiva, Teresa. "Sleep complaints and fatigue of airline pilots.". Sleep Science (2016): https://europepmc.org/articles/PMC5021958.
    Open access • Published • 10.1016/j.slsci.2016.05.003
  34. Reis, Cátia; Mestre, Catarina; Canhão, Helena; Gradwell, David; Paiva, Teresa. "Sleep and fatigue differences in the two most common types of commercial flight operations". (2016): http://hdl.handle.net/10451/27736.
    Published • 10.3357/AMHP.4629.2016
  35. Reis, Cátia; Reis, Cátia; Mestre, Catarina; Tecedeiro, Miguel Moreira Vaz; Paiva, Teresa. "Translation, cross-cultural adaptation and psychometric properties of the Jenkins Sleep Scale in a sample of Portuguese shift workers". Laboratório de Psicologia (2014): http://publicacoes.ispa.pt/index.php/lp/article/view/894/787.
    Open access • Published • doi: 10.14417/lp.894
  36. Reis, C.; de Queiroz, M.V.. "Prevalence of self-reported rheumatic diseases in a portuguese population". Acta Reumatologica Portuguesa 39 1 (2014): 54-59. http://www.scopus.com/inward/record.url?eid=2-s2.0-84897478093&partnerID=MN8TOARS.
  37. Reis C; Mestre C; Canhão H. "Prevalence of fatigue in a group of airline pilots.". (2013): http://europepmc.org/abstract/med/23926658.
    Published • 10.3357/ASEM.3548.2013